Image display medium driving device, image display apparatus, driving program, and computer-readable medium

Patent metadata

Field	Value
Publication number	US-10157581-B2
Application number	US-201715689199-A
Country	US
Kind code	B2
Filing date	Aug 29, 2017
Priority date	May 31, 2012
Publication date	Dec 18, 2018
Grant date	Dec 18, 2018

Abstract

A image display medium driving device includes a voltage application unit that applies a voltage between a pair of substrates, at least one of which is transparent, of an image display medium including plural types of particles which are sealed between the pair of substrates, are attached to the substrates, and start to be separated from the substrates at different times when a predetermined voltage is applied and a control unit that controls the voltage application unit such that a time when the voltage is applied between the pair of substrates varies depending on image information.

First claim

We claim:

1. A method of driving an image display apparatus containing an image display medium including plural types of particles sealed between a first and second substrate, each type of particles having a color and an adhesive force for maintaining attachment to the substrates, the method comprising:
applying a voltage between the first and second substrates using a voltage application unit for a time equal to or greater than a first separation start time of a first type of particles to initiate separation of the first type of particles from the first substrate,
wherein the first separation start time is less than a second separation start time of a second type of particles, and
wherein each of the types of particles has a separation time distribution equal to a percentage of each of the type of particles that separates from the first substrate over time during application of the voltage.

2. The method of claim 1 , wherein the voltage is applied for a duration to cause a portion (A) % of the first type of particles to separate from the first substrate, wherein the portion (A) % is greater than 50%.

3. The method of claim 2 , wherein the duration is less than the time needed to cause (100-A) % of the second type of particles to separate from the first substrate.

4. The method of claim 1 , wherein the voltage is applied for a duration to cause all of the first type of particles to separate from the first substrate.

5. The method of claim 1 , wherein the voltage is applied for a duration to cause all of the types of particles to separate from the first substrate and attach to the second substrate.

6. The method of claim 5 further comprising the step of reversing the polarity of the voltage and applying the voltage between the first and second substrates until at least a portion of the first type of particles separates from the second substrate.

7. The method of claim 1 ,
wherein the first type of particles has an average particle diameter greater than an average particle diameter of the second type of particles, and
a product of the average diameter and charge density of the first type of particles is greater than a product of the average diameter and charge density of the second type of particles.

8. The method of claim 1 , wherein a control unit controls the voltage application unit such that the time when the voltage is applied between the first and second substrates varies depending on image information.

9. The method of claim 8 , wherein the control unit is a computer and the voltage is applied according to a driving program stored in a non-transitory medium read by the computer.

Assignees

• E Ink Corp

Inventors

• Gan Taijyu
• Mizutani Ryota
• Suwabe Yasufumi
• Machida Yoshinori
• Hiji Naoki

Classifications

• G09G2310/068

  Application of pulses of alternating polarity prior to the drive pulse in electrophoretic displays · CPC title

• G09G3/2003

  Display of colours (specific for liquid crystal displays G09G3/3607) · CPC title

• G02F1/0121

  Operation of devices; Circuit arrangements, not otherwise provided for in this subclass · CPC title

• G09G2320/0242

  Compensation of deficiencies in the appearance of colours · CPC title

• G09G2310/0289

  Details of voltage level shifters arranged for use in a driving circuit · CPC title